HP D2200sb Serial Attached SCSI technology, 3rd edition - Page 13

Zoning, At the same time, you can use zone group 1 for topology discovery and zone management because - storage blade configuration

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Zoning The size of the expander routing tables controls the number of devices (initiators, targets, expanders, or virtual devices) allowed in a given domain. But managing a large number of devices can be very complicated. Zoning, introduced with the SAS-2 standard, breaks down topologies into logical groups for better efficiency (traffic management) and security. Implementing zoning in large topologies can be complex. Zoning can work well in small topologies like server blade enclosures and clustering environments using a common storage blade. This grouping allows access within and between controlled zone groups. A "zoned portion of a service delivery system" (ZPSDS) consists of a group of zoning-enabled expanders that cooperate to control access between PHYs. The SAS-2 standard allows either 128 or 256 zone groups (numbered from 0 to 127 or 0 to 255). Zone groups 0 through 8 are pre-defined and administrators cannot change them. Devices in zone group 0 can only access devices in zone group 1, while devices in zone group 1 have access to all zone groups. For example, you can use zone group 0 to add a new (unassigned) device to a ZPSDS. At the same time, you can use zone group 1 for topology discovery and zone management because it has access to all zone groups. Permission tables in SAS expanders control the zoning. This means that an end device does not require any special features to operate within a zoned SAS domain, which makes legacy SAS and SATA devices compatible. An end device in a zone can only "see" other end devices in the domain as permitted by the zoning expander(s). Figure 9 shows a SAS domain with a ZPSDS containing three zoning expanders in addition to one expander device without zoning enabled. Figure 9. A ZPSDS configured to allow only certain end devices to see each other 13

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Zoning
The size of the expander routing tables controls the number of devices (initiators, targets, expanders,
or virtual devices) allowed in a given domain. But managing a large number of devices can be very
complicated. Zoning, introduced with the SAS-2 standard, breaks down topologies into logical
groups for better efficiency (traffic management) and security. Implementing zoning in large
topologies can be complex. Zoning can work well in small topologies like server blade enclosures
and clustering environments using a common storage blade.
This grouping allows access within and between controlled zone groups. A “zoned portion of a
service delivery system” (ZPSDS) consists of a group of zoning-enabled expanders that cooperate to
control access between PHYs.
The SAS-2 standard allows either 128 or 256 zone groups (numbered from 0 to 127 or 0 to 255).
Zone groups 0 through 8 are pre-defined and administrators cannot change them. Devices in zone
group 0 can only access devices in zone group 1, while devices in zone group 1 have access to all
zone groups. For example, you can use zone group 0 to add a new (unassigned) device to a ZPSDS.
At the same time, you can use zone group 1 for topology discovery and zone management because
it has access to all zone groups.
Permission tables in SAS expanders control the zoning. This means that an end device does not
require any special features to operate within a zoned SAS domain, which makes legacy SAS and
SATA devices compatible. An end device in a zone can only “see” other end devices in the domain
as permitted by the zoning expander(s). Figure 9 shows a SAS domain with a ZPSDS containing three
zoning expanders in addition to one expander device without zoning enabled.
Figure 9.
A ZPSDS configured to allow only certain end devices to see each other
13